Here is the error message I am recieveing:



Here is my code for the button:

{!REQUIRESCRIPT("/apex/dsfs__DocuSign_JavaScript")}
DocuSign_CreateEnvelope();

//********* Option Declarations *********//
var
RC = '',
RSL = '',
RSRO = '',
RROS = '',
CCRM = '',
CCTM = 'Signer 2~Carbon Copy',
CCNM = '',
CRCL = '',
CRL = 'Email~{!JSENCODE(Contact.Email)};FirstName~{!JSENCODE(Contact.FirstName)};LastName~{!JSENCODE(Contact.LastName)};Role~Signer 1;RoutingOrder~1;RecipientNote~,Email~{!JSENCODE(Contact.Hidden_Real_Estate_Agent_Email__c)};FirstName~{!JSENCODE(Contact.Hidden_Real_Estate_Agent_First_Name__c)};Role~Signer 2;RoutingOrder~2;RecipientNote~{!JSENCODE(Contact.FirstName)} {!JSENCODE(Contact.LastName)} has signed the pre-approval letter.;LastName~{!JSENCODE(Contact.Hidden_Real_Estate_Agent_Last_Name__c)}',
OCO = 'Tag',
DST = '',
LA = '1',
CEM = '',
CES = 'xxxxxxxxxxxxxxxxx {!JSENCODE(Contact.FirstName)} {!JSENCODE(Contact.LastName)}',
STB = '0',
SSB = '1',
SES = '1',
SEM = '1',
SRS = '0',
SCS = '0',
RES = '1,0,0,1,90,1';

//********* Page Callout (Do not modify) *********//
window.location.href =
"/apex/dsfs__DocuSign_CreateEnvelope?DSEID=0&SourceID={!Contact.Id}&RC="+RC+
"&RSL="+RSL+"&RSRO="+RSRO+"&RROS="+RROS+"&CCRM="+CCRM+"&CCTM="+CCTM+"&CRCL="+CRCL+"&CRL="+CRL+"&OCO="+OCO+"&DST="+DST+"&CCNM="+CCNM+"&LA="+LA+"&CEM="+CEM+"&CES="+CES+"&SRS="+SRS+"&STB="+STB+"&SSB="+SSB+"&SES="+SES+"&SEM="+SEM+"&SRS="+SRS+"&SCS="+SCS+"&RES="+RES;
//*******************************************//